Loss of the Oil Pressure Indication on Engine 1

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1. Possible Causes
· XMTR-OIL PRESS ( 4003EN )
· pressure pump/filter
· wiring from the oil pressure transmitter (4003EN) to the EIU 1 (1KS1)
· wiring from the circuit breaker 2EN1 to the oil pressure transmitter (4003EN) pin A/1
· wiring from LOCK IND/PROX SENSOR-THRUST REV LOWER L ACTUATOR (4007KS) to TM824
· wiring from the OIL PRESS XMTR (4003EN) to TM824
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
Ref. AMM 71-00-00-710-046 Test No.2 : Wet Motor Leak Check
Ref. AWM 71-51-02
Ref. AWM 71-51-11
Ref. AMM 73-25-34-710-042 Operational Test of the EIU with the CFDS
Ref. AMM 79-20-00-200-010 General Visual Inspection of the Oil Distribution System Components,
Tubes and Joints
Ref. AMM 79-21-41-000-010 Removal of the Oil Pressure Pump and Filter Assembly
Ref. AMM 79-21-41-400-010 Installation of the Oil Pressure Pump and Filter Assembly
Ref. AMM 79-33-15-000-010 Removal of the Oil Pressure Transmitter
Ref. AMM 79-33-15-400-010 Installation of the Oil Pressure Transmitter
Ref. ASM 79-36-01
3. Fault Confirmation
Subtask 79-33-00-865-054-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
PANEL DESIGNATION FIN LOCATION
121VU ENGINE/ENG1/OIL/PRESS/AND REV
SNSR/CHAN A
2EN1 N40
Subtask 79-33-00-710-078-A
B. Test
(1) Do the operational test of the EIU 1 with the CFDS Ref. AMM 73-25-34-710-042 .
4. Fault Isolation
Subtask 79-33-00-810-065-A
A. If the test gives no maintenance message:
· do the general visual inspection of the oil distribution system components, tubes and joints Ref.
AMM 79-20-00-200-010 .
(1) If the fault continues:
· replace the XMTR-OIL PRESS ( 4003EN ) Ref. AMM 79-33-15-000-010 and Ref.
AMM 79-33-15-400-010 .
(2) If the fault continues:
· replace the pressure pump/filter Ref. AMM 79-21-41-000-010 and Ref. AMM 79-21-41-400-010 .
(3) If the fault continues:
· do a check and repair the:
. wiring from the oil pressure transmitter (4003EN) to the EIU 1 (1KS1) pins A/4,3
to pins AA/8D, 8B
. wiring from the circuit breaker 2EN1 to the oil pressure transmitter (4003EN) pin
A/1 Ref. ASM 79-36-01.
. wiring from LOCK IND/PROX SENSOR-THRUST REV LOWER L ACTUATOR
(4007KS) to TM824 Ref. AWM 71-51-11.
. wiring from the OIL PRESS XMTR (4003EN) to TM824 Ref. AWM 71-51-02.
Subtask 79-33-00-710-079-A
B. Do the wet motor leak check Ref. AMM 71-00-00-710-046 and make sure that the oil pressure indication
is shown (no amber XX). [Rev.6 from Feb 2017] 2026.04.04 04:38:30 UTC